Now, even if the boulder should fall, they still had a chance.

It looked as if a larger boulder had fallen from the rim and shattered on impact.

"I thought all those rocks and boulders would fall on my mom."

However, he kept in close under the sheer rock face so that any boulder would fall beyond them.

Oh, sure, she might say something along the lines of "Watch out, that boulder is falling on you!"

He pointed to a place in the canyon wall, visible only to himself, from which the boulder had fallen.

Evidently a boulder or something had fallen here, and smashed out a section.

The helmet helped Clutch when a boulder fell on his head.

His car was completely flattened when a huge boulder fell on it.

You want a boulder to fall on your head?